﻿//
// (C) Copyright 2009 Irantha Suwandarathna (iranthas@hotmail.com)
// All rights reserved.
//

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use _in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
#if !SILVERLIGHT
using System.Data.Common;
using System.Data;
#endif
using EffiProz.Core.Errors;
using EffiProz.Core.Lib;

namespace EffiProz.Core.DataTypes
{
    public class BlobType : BinaryType
    {
        public const long maxBlobPrecision = 1024L * 1024 * 1024 * 1024;
        public const int defaultBlobSize = 1024 * 1024 * 16;

        public BlobType()
            : base(Types.SQL_BLOB, defaultBlobSize)
        {

        }

        public BlobType(long precision)
            : base(Types.SQL_BLOB, precision)
        {

        }

        public override int displaySize()
        {
            return precision > int.MaxValue ? int.MaxValue
                                                 : (int)precision;
        }

        public override int getAdoTypeCode()
        {
#if !SILVERLIGHT
            return (int)DbType.Binary;
#else
            return -1;
#endif
        }

        public override String getCSharpClassName()
        {
            return "System.Byte[]";
        }

        public override String getNameString()
        {
            return Tokens.T_BLOB;
        }

        public override String getFullNameString()
        {
            return "BINARY LARGE OBJECT";
        }

        public override String getDefinition()
        {

            long factor = precision;
            String multiplier = null;

            if (precision % (1024 * 1024 * 1024) == 0)
            {
                factor = precision / (1024 * 1024 * 1024);
                multiplier = Tokens.T_G_FACTOR;
            }
            else if (precision % (1024 * 1024) == 0)
            {
                factor = precision / (1024 * 1024);
                multiplier = Tokens.T_M_FACTOR;
            }
            else if (precision % (1024) == 0)
            {
                factor = precision / (1024);
                multiplier = Tokens.T_K_FACTOR;
            }

            StringBuilder sb = new StringBuilder(16);

            sb.Append(getNameString());
            sb.Append('(');
            sb.Append(factor);

            if (multiplier != null)
            {
                sb.Append(multiplier);
            }

            sb.Append(')');

            return sb.ToString();
        }

        public override bool acceptsPrecision()
        {
            return true;
        }

        public override bool requiresPrecision()
        {
            return false;
        }

        public override long getMaxPrecision()
        {
            return maxBlobPrecision;
        }

        public override bool isBinaryType()
        {
            return true;
        }

        public override bool isLobType()
        {
            return true;
        }

        /** @todo implement comparison */
        public override int compare(Session session, Object a, Object b)
        {

            if (a == b)
            {
                return 0;
            }

            if (a == null)
            {
                return -1;
            }

            if (b == null)
            {
                return 1;
            }

            long aId = ((BlobData)a).getId();
            long bId = ((BlobData)b).getId();

            return (aId > bId) ? 1
                               : (bId > aId ? -1
                                            : 0);
        }

        /** @todo - implement */
        public override Object convertToTypeLimits(SessionInterface session, Object a)
        {
            return a;
        }

        public override Object convertToType(SessionInterface session, Object a,
                                    SqlType otherType)
        {

            if (a == null)
            {
                return null;
            }

            if (otherType.typeCode == Types.SQL_BLOB)
            {
                return a;
            }

            if (otherType.typeCode == Types.SQL_BINARY
                    || otherType.typeCode == Types.SQL_VARBINARY)
            {
                return new BinaryData(((BinaryData)a).data, false);
            }

            throw Error.error(ErrorCode.X_42561);
        }

        public override Object convertToDefaultType(SessionInterface session, Object a)
        {

            if (a == null)
            {
                return a;
            }

            // conversion to Blob via PreparedStatement.setObject();
            if (a is byte[])
            {
                return new BinaryData((byte[])a, false);
            }

            throw Error.error(ErrorCode.X_42561);
        }

        public override String convertToString(Object a)
        {

            if (a == null)
            {
                return null;
            }

            byte[] bytes = ((BlobData)a).getBytes();

            return StringConverter.byteArrayToHexString(bytes);
        }

        public override String convertToSQLString(Object a)
        {

            if (a == null)
            {
                return Tokens.T_NULL;
            }

            byte[] bytes = ((BlobData)a).getBytes();

            return StringConverter.byteArrayToSQLHexString(bytes);
        }
    }
}
